1. Articles from Chandra Shakher

    1-6 of 6
    1. Transmission Mode Full-Field Swept-Source Optical Coherence Tomography for Simultaneous Amplitude and Quantitative Phase Imaging of Transparent Objects

      Transmission Mode Full-Field Swept-Source Optical Coherence Tomography for Simultaneous Amplitude and Quantitative Phase Imaging of Transparent Objects
      A transmission mode full-field swept-source optical coherence tomographic system is demonstrated for simultaneous amplitude and quantitative phase imaging of transparent objects. The experimental setup consists of a swept-source system, fiber-optic Mach–Zehnder interferometer, and an area detector. By means of sweeping the wavelength of light source, multiple interefrograms were recorded and both amplitude as well as phase images of the multilayer object and onion skin were reconstructed. The main advantages of the present system are: light passes through the sample only once; high throughput; wide field; compact; and completely nonmechanical scanning.
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    2. Swept-source digital holography to reconstruct tomographic images

      Swept-source digital holography to reconstruct tomographic images
      We present what we believe to be a new method of swept-source digital holography using a superluminescent diode (SLD) as a broadband light source and an acousto-optic tunable filter (AOTF) as a frequency tunable device. The swept source consists of an SLD as a broadband source in conjunction with the AOTF as the frequency tuning device in the wavelength range of 800–870 nm. Since the AOTF is an electronically controlled device, frequency tuning can be achieved without mechanical movement . The angular spectrum approach to the scalar diffraction theory is used to reconstruct the images for each wavelength. Applications of ...
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    3. Simultaneous tomography and topography of silicon integrated circuits using full-fieldswept-source optical coherence tomography

      Abstract. We demonstrate simultaneous tomography and topography of micro-electro-mechanical systems based on silicon integrated circuits using full-field swept-source optical coherence tomography. The optical set-up consists of a swept-source system, a compact Michelson interferometer, and an area detector. The swept-source system comprises a superluminescent diode as a broadband light source in conjunction with an acousto-optic tunable filter as a fast frequency tuning device. By means of sweeping the frequency of the light source, multiple interferograms were recorded and both the amplitude and the phase map of the interference fringe signal were reconstructed. Optically sectioned images of the silicon integrated circuits were ...
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    4. Full-field swept-source optical coherence tomography with Gaussian spectral shaping

      Satish Kumar Dubey, Gyanendra Sheoran, Tulsi Anna et al. A swept source system was realized in the wavelength range of 810-875 nm with the combination of a broad-band superluminescent diode (SLD) and an acousto-optic tunable filter (AOTF) as a frequency-tuning device. SLD has two spectral centers at 820 nm and 845 nm with spectral bandwidth (FWHM) of arou ... [Proc. SPIE 7155, 71551F (2008)] published Fri Oct 3, 2008.
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    5. Simultaneous topography and tomography of latent fingerprints using full-field swept-source optical coherence tomography

      Simultaneous topography and tomography of latent fingerprints using full-field swept-source optical coherence tomography 1 Laser Applications and Holography Laboratory, Instrument Design Development Centre, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110 016, India 2 Institute for Plasma Research, Bhat, Gandhinagar, 382428, India E-mail: dsmehta@iddc.iitd.ac.in Abstract. We demonstrate simultaneous topography and tomography of latent fingerprints using full-field swept-source opti
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    6. Fingerprint detection using full-field swept-source optical coherence tomography

      Fingerprint detection using full-field swept-source optical coherence tomography Appl. Phys. Lett. 91, 181106 (2007) (3 pages) Issue Date: 29 October 2007 Satish Kumar Dubey, Tulsi Anna, Chandra Shakher, and Dalip Singh Mehta Laser Applications and Holography Laboratory, Instrument Design Development Centre, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016, India We^ report the application of full-field swept-source optical coherence tomography for^ fingerprint detection. This
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    1-6 of 6
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  2. Topics in the News

    1. (6 articles) Indian Institute of Technology at Delhi
    2. (5 articles) Chandra Shakher
    3. (5 articles) Dalip Singh Mehta
    4. (4 articles) Satish Kumar Dubey
    5. (1 articles) Sun Yat-Sen University
    6. (1 articles) National Institutes of Health
    7. (1 articles) University of Illinois at Urbana-Champaign
    8. (1 articles) Tianjin University
    9. (1 articles) Zhejiang University
    10. (1 articles) New York Eye and Ear Infirmary
    11. (1 articles) Eric J. Chaney
    12. (1 articles) Jun Zhang
    13. (1 articles) Robert Ritch
    14. (1 articles) Stephen A. Boppart
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    Swept-source digital holography to reconstruct tomographic images Transmission Mode Full-Field Swept-Source Optical Coherence Tomography for Simultaneous Amplitude and Quantitative Phase Imaging of Transparent Objects Optical coherence tomography angiography in glaucoma Handheld optical coherence tomography for clinical assessment of dental plaque and gingiva Characterisation of macular superficial vessel density alteration in preclinical ethambutol-induced optic neuropathy using optical coherence tomography angiography Three-dimensional spatial reconstruction of coronary arteries based on fusion of intravascular optical coherence tomography and coronary angiography Dynamic-range compression and contrast enhancement in swept-source optical coherence tomography systems with a frequency gain compensation amplifier Healing and early stent coverage after ultrathin strut biodegradable polymer-coated sirolimus-eluting stent implantation: SiBi optical coherence tomography study Optical coherence tomography angiography of choroidal neovascularization in immune choroiditis following acute retinal necrosis Operation Night Watch: getting closer to Rembrandt despite distancing Anatomical and functional healing after resorbable magnesium scaffold implantation in human coronary vessels: A combined optical coherence tomography and quantitative flow ratio analysis "Predicting Glaucoma Progression With Optical Coherence Tomography Structural and Angiographic Parameters".